750 Gallon Plastic Water Storage Tank: Complete Buyer's Guide
A 750-gallon black water tank from Norwesco built tall and slender on a 46-inch base, seamlessly molded in FDA-grade polyethylene for strong gravity feed where ground is tight.
Specifications at a Glance
Every figure below is pulled straight from the live product record for this exact tank — the same data on the product page, so what you read here and what you buy never disagree.
Standards & Materials
- ASTM D1998 — Standard Specification for Polyethylene Upright Storage Tanks. Governs wall-thickness and hydrostatic design for vertical rotomolded poly tanks of this class.
- FDA 21 CFR 177.1520 — Olefin polymers. The food-contact regulation the FDA-grade resin in this tank is compounded to meet.
- Specific gravity rating 1.1 — the tank is engineered for liquids up to 1.1× the density of water (water is about 8.34 lb/gal). Confirm your fluid’s SG before storage.
Product Overview
The 750-gallon Norwesco is built tall and slender — 107 inches of height on a 46-inch diameter — which makes it the right tank when you need three-quarters of a thousand gallons but only have a narrow strip of ground to put it on. That 46-inch base occupies barely 11.5 square feet, yet the deep liquid column gives you strong gravity feed all the way to the last gallons. Empty, the shell is a manageable 100 pounds.
It is rotomolded in one seamless piece of virgin linear polyethylene with UV black pigment in the resin, so the wall blocks sunlight and keeps a substantial water store dark and clear. Rated to 1.1 specific gravity, it carries water and compatible liquids to 9.2 pounds per gallon, and it is FDA-approved for potable and food-grade contact.
Filled, the tank presses down with about 6,981 pounds — roughly three and a half tons concentrated on that small base — so the pad has to be both flat and firm. A factory 2-inch NPT outlet and a 1.5-inch NPT inlet handle the plumbing, both leak-tested, and the 16-inch lid opens the top for cleaning or a level sensor. Norwesco's 3-year warranty applies.
Technical Drawing
Official Norwesco technical drawing — 750 Gallon Plastic Water Storage Tank
Key Features and Specifications
- 750-gallon capacity — sized for safe potable water storage
- Constructed from virgin linear polyethylene (HDPE) with 1.1 specific gravity rating — handles liquids up to 9.2 lbs/gal
- 107" tall x 46" diameter — compact vertical footprint
- 100 lbs empty, approximately 6,981 lbs when full at rated specific gravity
- 2" NPT outlet fitting — factory installed and leak-tested
- 1.5" NPT inlet fitting included
- 16" lid opening for fill, venting, and interior access
- FDA approved for potable water and food-grade liquid contact
- 3 Year Warranty from Norwesco against manufacturing defects
- UV-resistant black pigmentation provides maximum outdoor durability and inhibits algae growth in stored liquids
- Rated for continuous service up to 120 F / 48 C
- Seamless one-piece rotational molding — no seams, no welds, no leak points
- Manufactured by Norwesco — a leading name in rotomolded polyethylene tanks
- Place on a firm, level surface free of rocks or sharp objects that could damage the tank bottom. Ensure adequate ventilation if stored chemicals produce vapors
- Ships via LTL freight — allow 2-3 weeks for delivery. Lift gate and residential delivery available at additional cost
Installation and Setup Guide
The 750's tall, narrow build is its great strength and its one demand: a 107-inch column on a 46-inch base concentrates three and a half tons into a tight circle and will not tolerate a tilt. Level is everything here.
Site Preparation
Build a four-inch compacted gravel pad or a concrete slab sized to the full 46-inch base, finished flat to within a quarter inch across the circle. Because the footprint is small and the tank is tall, any unevenness becomes both a stress point and a lean — so level it carefully and clear out every stone before the tank touches down. Pick ground that drains and is sheltered from the strongest wind.
Placement and Connections
Keep two feet of clearance all around for service and so the tall shell never rests against a structure. Aim the 2-inch outlet at the shortest pipe run. Connect both the outlet and the 1.5-inch inlet through flexible couplings for the first foot; the tall wall's thermal movement will eventually loosen any rigid connection.
Venting
The deep column makes venting important — a quick draw on tall water builds vacuum fast. A screened lid vent sized to your pump lets air follow the water both ways and keeps the slender wall from oil-canning inward.
Maintenance and Long-Term Care
On the tall 750, the inspection follows the load down to the base and up to the vent — the two places that matter most on a deep, narrow tank.
Quarterly Inspection Checklist
- Lower wall: look hardest at the bottom band, where the full column's pressure concentrates; a bulge there means a settled pad or an overweight liquid.
- Fittings: hand-snug the 2-inch outlet and 1.5-inch inlet, a quarter turn past finger-tight, no wrench.
- Plumb and pad: confirm the tall tank still stands straight and the small footprint is fully and evenly supported.
- Vent: verify the lid vent is open — on a deep tank a blocked vent deforms the wall quickly.
Cleaning
As a potable tank, flush annually: drain, sanitize with unscented bleach at about a quarter cup per 15 gallons of clean water, hold two hours so it reaches the full depth, and rinse until odor-free. The narrow shape concentrates sediment in a small bottom area, making the yearly rinse quick despite the tank's height.
UV and Weather Protection
Black resin makes this tank the right pick for full sun. Glance at the western face yearly for chalk, and in desert climates a shade screen on the sun side adds years and keeps the deep water cooler.
Alternatives and Comparisons
The 750 in this 46-by-107 form is the space-saver of its volume class. Where ground is plentiful, a wider 750 sits more stably and lower; where you are squeezed against a wall, this slim column is the answer. The natural-white liquid-storage version of the same shell trades the black algae barrier for a translucent level gauge, which suits a farm chemical rather than drinking water. Need more reserve in the same strip? The 1,000 and 1,100 tanks step up.
Other 750-Gallon Options
Frequently Asked Questions
How long will the 750 Gallon Plastic Water Storage Tank last?
Fifteen to twenty years, leaning long when the tank stands plumb on a flat pad and stays within its 1.1 SG and 120 F limits. A tall tank is especially sensitive to its foundation, so a true base is what carries the seamless black shell to the high end of that range.
What chemicals can I store in this tank?
It is built for potable water and FDA-cleared for drinking water and food-grade liquids, and within 1.1 specific gravity it holds light farm and cleaning solutions. No fuels, solvents, or flammables, and nothing denser than 9.2 pounds per gallon. Confirm compatibility before storing any new liquid.
What kind of foundation does a 750-gallon tank need?
Full it weighs about 6,981 pounds — three and a half tons — concentrated on a 46-inch base, so a four-inch gravel pad or concrete slab is the minimum, and it must be flat and stone-free. Because the tank is 107 inches tall, an out-of-level pad shows up as a lean and accelerates wear.
Does this tank come with a warranty?
Norwesco's three-year warranty covers any factory defect, from a molding void to a faulty fitting. Not covered: overloading, a poor pad, incompatible chemicals, or impact damage. Save the receipt and a few install photos for any future claim.
Can I install this tank underground?
No. This is an above-ground tank, and a tall vertical shell cannot resist soil pressure; burial risks collapse and voids the warranty. Use a ribbed underground cistern for below-grade water.
Buying Considerations
Three checks before ordering. First, that the spot is genuinely level — a 107-inch tank punishes a tilt. Second, that your contents are water-weight or lighter, at or below 1.1 SG. Third, the freight: this tank ships LTL by flatbed and needs a forklift to come off the truck. Share your access details and we will arrange the right delivery.
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